.app{
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
.app .top,.center{
    text-align: center;
}
.app .top img{
    width: 2.4rem;
    height: 1.2rem;
    margin-bottom: 0.4rem;
}
.app .top p{
    width:4.16rem;
    height: 0.96rem;
    font-size: 0.32rem;
    font-weight: 500;
    line-height: 0.48rem;
    color: #5e5e5e;
    text-align: center;
}
.app .center img{
    width: 3rem;
    height: 3rem;
    margin:1.2rem 0 0.4rem;
}
.app .center p{
    width: 5.2rem;
    height: 1.44rem;
    font-size: 0.28rem;
    font-weight: normal;
    color: #5E5E5E;
    text-align: center;
    line-height: 0.48rem;
}
.app .btn{
    width: 4.38rem;
    height: 0.8rem;
    border-radius: 0.08rem;
    background: #12B0DB;
    line-height: 0.8rem;
    margin-top:2rem;
    font-weight: 500;
    text-align: center;
    font-size: 0.32rem;
    color: #ffffff;
}